Actually as someone who was a massive fan of MJ, if you look at his kids ESPECIALLY "Blanket" (now known as Bigi), they are mixed race.
Paris is the one that looks the most "white" but mixed race people with African American ancestry can pass as white. Look at Nicole Richie or Halsey for example.
Prince has vitiligo, which would be a huge coincidence if he wasn't MJ's biological kid.
But the third child, is the one who looks the most like MJ and I believe he absolutely is MJ's son. Look at the side by side face comparison of how MJ looked as a young man, vs Bigi today.